package com.ddd.filter;

import com.ddd.domain.LoginUser;
import com.ddd.util.JwtUtil;
import com.ddd.util.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        // 获取token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)){
            filterChain.doFilter(request,response);
            return;
        }
        // 解析token
        Claims claims = JwtUtil.parseJWT(token);
        String userId = claims.getSubject();
        // 从redis中获取信息
        String redisKey = "login:" + userId;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);

        if (Objects.isNull(loginUser)){
            throw new RuntimeException("用户未登录");
        }

        // 存入SecurityContextHolder
        UsernamePasswordAuthenticationToken authenticationToken
                = new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());

        SecurityContextHolder.getContext().setAuthentication(authenticationToken);

        filterChain.doFilter(request,response);
    }
}
